单项选择题 Which of the following commands would launch the Windows utility that stops the print spooler?（）

单项选择题 Which of the following can cause a ribbon on an impact printer to tear?（）

单项选择题 A user is unable to print to the network printer. A print job appears in their print queue and cannotbe deleted. The user has the correct permissions to modify and delete print jobs. All other users are able to print to the network printer. Which of the following procedures should the technician try FIRST?（）